This instructable is on how to make the perfectest of perfect paper airplane.
First, folder your piece of 8" by 11 1/2" sheet of paper perfectly in half. I find it very useful to go over the crease with a pen or pencil edge to make the crease nice and sharp. After you fold the paper in half open it up.
Next, pull down both corners to the center line, creating a triangle at the top of the paper.
Pull the tip of the triangle to the center of the bottom of the triangle. Then open up the whole page.
Now you will see a box on the top of the page. Pull it down.
You will now see 4triangles. Pull in both edge triangles.
Flip down the trapezoid, keep the center line!
Pull the top corners to the bottom middle of the trapezoid. Then open it up.
Close in the angles you just made. Then fold in half.
Make wings and you are done. ;)